• Original ball-type, specific gravity tester
• Accurate to -34ºF., indicating 50/50 mix
• Special “6th ball” shows overprotection
• Extra long neoprene dip tube
• Vinyl pocket protector
• Rugged safety shield of ABS plastic
• Also used to test Dex-Cool®
• Vinyl case imprinted with protection scale
(California Prop 65)